Asbestos lumber cell door



April 10, l 934.

C. F. HAFF ASBESTOS LUMBER CELL DOOR Filed Sept. 1, 1933 ,5f 6i o] b o O0%:6

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f IL., 'nu /Ly. l 0 /2 2 lI 5 'Z2 o o 66M m@ am Patented Apr. 10, 1934UNITE STATES PATENT FFICE Asbestos Shingle & Sheathing Company,

Ambler, Pa., a corporation of Pennsylvania.

Application September 1. 1933, Serial No. 687,855

2 Claims.

This invention relates to door construction, and particularly a doorformed of Structural units of a composite material, such as a compoundof asbestos fibre and Portland cement, and which I 5 term asbestoslumber.

Among the several objects of this invention is first that of providing adoor of a minimum number of elements, all formed of the asbestos cementcomposition, which therefore renders the doorflreproof; secondly, thatof providing a door, the elements of which are soy joined, particularlyat their corners, that a maximum of strength is obtained at these pointswhere the door is usually subjected to strain and Warpage; and third,the provision of a door which is simple in construction and whichpresents a neat appearance. Among the features present in thisconstruction is the specific joint fastening means and the manner oftheir application.

In the accompanying drawing,

Fig. 1 is a front elevation of the door;

Fig. 2 is a rear elevation of the upper portion of the door;

Fig. 3 is a side view of the door with the upper right hand corner shownin vertical section to illustrate the corner joint and the fasteningdevices; and

Fig. 4 is an enlarged detail view of the upper left hand corner of thedoor shown in Figure 1.

Referring now more specically to the drawing by numerals of reference, 1indicates the door in general, said door comprising a frame includingvertical side stiles 2, center cross rails 3, and to-p horizontal crossrails e, joined into the rectangular structure shown in Figure 1.Secured to this frame on the rear thereof, as .seen in Figure 2, is apanel 5, all the aforesaid elements being formed of the composition ofasbestos and cement, and formed by molding, pressing or other suitableprocess.

Since each of the four corners of the door frame is similarly formed andconnected, a description of one will be sufficient for a fullunderstanding of them all, the speciiic details being quite wellillustrated by reference particularly to Figure 3 which shows in sectionsuch a construction which I prefer to provide.

To form the corner joint as shown, the vertical stilesV and upper andlower cross rails 4, which in actual construction are approximately 3A"in thickness, are reduced in thickness at their ends to for a distanceback from their extreme ends, equal to the width of the respectivestiles and cross rails, the reduced portions being associated to providea lap-joint 5 shown in Figure 3,

pass through the panel 5 at this point in the the contacting surfaces ofthe joined elements being suitably cemented before being permanentlyassociated.

For the purpose of rigidly fastening the corner joints, as shown inFigure 3, I propose to 6o provide the lapped portions with registeringopenings 6 and 7, the former, namely those in the vertical stiles 2,being enlarged on the outer face side thereof to provide countersinks 16to receive the heads of fastening bolts 8, known in the building art asChicago binding posts, although other and suitable securing means mightbe employed. Specifically, these bolts 8 which pass through theregistering openings 6 and 7 at each of the four corners of the doorframe, comprise screw threaded telescoping members, each having a kerfedhead 9.

Applied to the rear face of the door frame is a rectangular panel 5,also of asbestos cement composition, said panel extending entirely overthe door frame members to substantially the extreme top, bottom and sidemarginal edges thereof, the contacting surfaces of adjacent portionsbeing first cemented before being permanently joined, as by thefastening bolts 8 Which pass through openings l1 in the corners of saidpanel, registering with the openings 6 and 7 in the lapped portions ofthe stiles and cross rails 2 and 4 respectively. At suitably spacedintervals along each side, top and bottom of the door frame, said panel5 is connected With the stiles and rails by similar bolts 8 passingthrough registering openings in each.

Intermediate its length, each of the vertical stiles 2 on its rear face,is reduced to about onehalf its thickness as at 12 to receive thesimilarly reduced ends 14 of the central cross rail 3 as' shown in Fig.3, the lapped portions being rigidly connected by fastening bolts 8Which also structure.

The countersunk recesses 16 which are provided in the outer faces of thestiles and cross rails, and also in the rear face of the panel arefilled by asbestos cement plugs 17 or any other suitable cement for thepurpose of giving the outer face of the door a plain surface, unbrokenor marred by unsightly holes or other openings, and permitting the doorto be artistically decorated by painting or otherwise.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. A door construction comprising a frame formed of vertical stile andhorizontal cross rail members of iireproof asbestos cement composition,a panel of reproof asbestos cement secured to the rear face of saidframe and extending substantially to the extreme top side and bottomedges thereof, said stile, rail and panel members having registeringopenings, fastening bolts passing through said openings and securingsaid elements in rigid relation, and means for concealing the heads ofsaid fastening bolts.

2. A door construction comprising a frame formed of vertical stile andtransverse upper and lower cross rail members of reproof asbestoscomposition having lapped corner joints, the portions of said members atsaid joints being

